How did Macdonald's role as Prime Minister change during the CPR project?

The answer that aligns with the historical context of Macdonald's role during the construction of the Canadian Pacific Railway (CPR) is the option regarding losing his position to Alexander Mackenzie. During this time, Macdonald faced significant political challenges and opposition related to the CPR project, which included difficulties in funding, project delays, and criticism over government expenditures. These challenges culminated in a loss of support that eventually led to Macdonald's defeat in the 1873 election.

After his defeat, Alexander Mackenzie took over as Prime Minister and shifted the focus away from the CPR, reflecting a significant change in leadership and policy direction. This period is notable as it altered the course of the railway project, which was a critical infrastructure initiative for Canada, intended to connect the vast country and promote settlement and commerce.

Understanding this shift in leadership is important for grasping the political landscape of the time, including the implications for Canada’s development and the eventual return of Macdonald to power, which later reinstated momentum toward completing the CPR project.